<template>
  <div>
      <!-- 面包屑导航区域 -->
        <el-breadcrumb>
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert
                :closable="false"
                show-icon
                title="注意！只允许为第三级分类设置相关参数！"
                type="warning">
            </el-alert>
            <!-- <el-row :gutter="10">
                <el-col :span="24">
                    <span>选择商品分类：</span> -->
                    <!-- 选择商品分类的级联选择框 -->
                    <!-- <el-cascader
                        v-model="selectedCateKeys"
                        :options="catelist"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row> -->
            <!-- 选择商品分类区域 -->
             <el-row class="cat_opt">
                <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader :options="catelist" 
                    :props="cateProps" v-model="selectedCateKeys" @change="handleChange"
                    ref="cascaderRef">
                </el-cascader>
                </el-col>
            </el-row>
            <!-- Tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button size="mini" type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableParams">
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染 Tag 标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
                                <!-- 文本框 -->
                                <el-input class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column prop="attr_name" label="参数名称" ></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button size="mini" type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableParams">
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染 Tag 标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
                                <!-- 文本框 -->
                                <el-input class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column prop="attr_name" label="属性名称" ></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <!-- <label>{{ scope.row }}</label> -->
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加动态参数/静态属性对话框 -->
        <el-dialog :title="'添加' + titleText" 
            :visible.sync="addDialogVisible" width="50%" 
            :close-on-click-modal="false"
            :close-on-press-escape="false"
            @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改对话框 -->
        <el-dialog :title="'修改' + titleText" 
            :visible.sync="editDialogVisible" width="50%" 
            :close-on-click-modal="false"
            :close-on-press-escape="false"
            @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            // 分类数据列表
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                expandTrigger: 'hover',
                checkStrictly: true,
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定的数组
            selectedCateKeys: [],
            // 被激活的页签的名称
            activeName: 'many',
            // 控制按钮是否可用的变量
            // isBtnDisabled: true
            // 动态参数数据
            manyTableParams: [],
            // 静态属性数据
            onlyTableParams: [],
            // 控制添加动态参数/静态属性的对话框
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数/属性名称', trigger: 'blur' }
                ]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible: false,
            // 修改表单的数据对象
            editForm: {},
            // 修改表单的验证规则
            editFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数/属性名称', trigger: 'blur' }
                ]
            },
            // 控制按钮与文本框的切换显示
            // inputVisible: false,
            // 文本框输入的内容
            // inputValue: ''
        }
    },
    // 点击后下拉框自动收起实现
    // 设置每次监听值变化的时候，把 dropDownVisible 属性设置为 false 即可。（这个属性，官网根本没有说… ）
    watch: {
        selectedCateKeys() {
            if(this.$refs.cascaderRef) {
                this.$refs.cascaderRef.dropDownVisible = false
            }
        }
    },
    created() {
        this.getCateList()
    },
    computed: {
        // 如果按钮需要被禁用，则返回 true 否则返回 false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的三级分类的 ID
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[this.selectedCateKeys.length - 1]
            }
            return null
        },
        // 动态计算标题的文本
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    },
    methods: {
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            if(res.meta.status != 200) {
                this.$message.error('获取商品分类列表失败！')
            }
            this.catelist = res.data
        },
        // 级联选择框选中项变化的事件
        handleChange() {
            this.getParamsData()
        },
        // Tab 页签点击事件的处理函数
        handleTabClick() {
            this.getParamsData()
            console.log(this.activeName);
        },
        // 获取参数的列表数据
        async getParamsData() {
            // console.log(this.selectedCateKeys);
            if(this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                // this.isBtnDisabled = true
                this.manyTableParams = []
                this.onlyTableParams = []
                return
            }
            // this.isBtnDisabled = false
            // console.log(this.selectedCateKeys);
            // 根据所选分类的的 id 和当前所处的面板，获取对应的参数
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, 
                { params: { sel: this.activeName } })
            if(res.meta.status !== 200) {
                return this.$message.error('获取参数列表失败！')
            }
            console.log(res.data);
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制文本框与按钮的切换显示
                item.inputVisible = false
                // 文本框输入的内容
                item.inputValue = ''
            })
            if(this.activeName === 'many') {
                this.manyTableParams = res.data
            } else {
                this.onlyTableParams = res.data
            }
        },
        // 对话框关闭事件，重置表单
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 添加参数/属性
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, 
                    { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
                if(res.meta.status !== 201) {
                    // return this.$message.error('添加' + this.titleText + '失败！')
                    return this.$message.error(`添加${this.titleText}失败！`)
                }
                // this.$message.success('添加' + this.titleText + '成功！')
                this.$message.success(`添加${this.titleText}成功！`)
            })
            this.getParamsData()
            this.addDialogVisible = false
        },
        // 显示修改对话框
        async showEditDialog(attr_id) {
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, 
                { params: { attr_sel: this.activeName } })
            // console.log(res.data);
            if(res.meta.status !== 200) {
                return this.$message.error(`获取${this.titleText}信息失败！`)
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 修改对话框关闭事件，重置表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 修改参数/属性
        async editParams() {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, 
                { attr_name: this.editForm.attr_name, attr_sel: this.editForm.attr_sel })
            if(res.meta.status !== 200) {
                return this.$message.error(`修改${this.titleText}失败！`)
            }
            this.$message.success(`修改${this.titleText}成功！`)
            this.getParamsData()
            this.editDialogVisible = false
        },
        // 根据 id 删除参数/属性
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm('此操作将永久删除该参数/属性, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(error => error)
            if(confirmResult !== 'confirm') {
                return this.$message.info('已取消了删除！')
            }
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status !== 200) {
                this.$message.error(`删除${this.titleText}失败！`)
            }
            this.getParamsData()
            return this.$message.success(`删除${this.titleText}成功！`)
        },
        // 文本框失去焦点或按下 enter 键触发的事件
        // async handleInputConfirm(row) {
        handleInputConfirm(row) {
            // console.log('ok');
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有 return 则输入的内容需要作后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求，保存这次操作
            // const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            //     {
            //         attr_name: row.attr_name,
            //         attr_sel: row.attr_sel,
            //         attr_vals: row.attr_vals.join(' ')
            //     }
            // )
            // if(res.meta.status !== 200) {
            //     return this.$message.error(`添加${this.titleText}项失败！`)
            // }
            // this.$message.success(`添加${this.titleText}项成功！`)

            this.saveAttrVals(row)

        },
        // 点击按钮事件
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick 函数的作用是当页面元素被重新渲染后，再执行架设函数
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // Tag 标签关闭事件
        handleClose(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)

        },
        async saveAttrVals(row) {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(' ')
                }
            )
            if(res.meta.status !== 200) {
                return this.$message.error(`添加${this.titleText}项失败！`)
            }
            this.$message.success(`添加${this.titleText}项成功！`)
        }
    }
}
</script>

<style lang="less" scoped>
    .cat_opt {
        margin: 15px 0;
    }

    // .el-cascader {
    //     width: 30%;
    // }

    // .el-tag {
    //     margin: 5px;
    // }

    .el-tag + .el-tag {
        margin-left: 10px;
    }

    // .input-new-tag {
    //     margin: 5px;
    //     width: 100px;
    // }

    .input-new-tag {
        width: 90px;
        margin-left: 10px;
        vertical-align: bottom;
    }

    // .button-new-tag {
    //     margin: 5px;
    // }

    .button-new-tag {
        margin-left: 10px;
        height: 32px;
        line-height: 30px;
        padding-top: 0;
        padding-bottom: 0;
    }
</style>